回转式空气预热器积灰模型构建与积灰工况传热性能研究  

Development of a Fouling Model for Rotary Air Preheaters and Study on Heat Transfer Performance under Fouling Conditions

作　　者：高荣泽 杨云 袁斌彬 李玲忠 方顺利[3] 查琼亮 王利民 车得福[1] GAO Rongze;YANG Yun;YUAN Binbin;LI Lingzhong;FANG Shunli;ZHA Qiongliang;WANG Limin;CHE Defu(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Huaneng Lanzhou Thermal Power Co.,Ltd.,Lanzhou 730104,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]华能兰州热电有限责任公司,兰州730104 [3]西安热工研究院有限公司,西安710054

出　　处：《西安交通大学学报》2024年第10期108-120,共13页Journal of Xi'an Jiaotong University

基　　金：中国华能集团有限公司总部科技项目(HNKJ22-H34);陕西省自然科学基础研究计划资助项目(2033-JC-QN-0482)。

摘　　要：为了量化研究积灰状态下回转式空气预热器(空预器)对运行条件的敏感性,构建基于局部热非平衡模型的三方程回转式空预器热力计算模型,探究了积灰分布与运行条件对空预器传热性能和硫酸氢铵(ABS)沉积的综合影响,对比分析了积灰热阻与热容对空预器的影响规律。计算结果表明:积灰热阻对传热性能的削弱效果远大于积灰热容对传热的强化效果;冷段积灰比例的增加使得ABS沉积区比例增大;当蓄热元件表面积灰厚度增加时,提高转速、增大流量或提升机组负荷对改善传热性能及减小ABS沉积区比例的效果尤为显著;改变流体温度对空预器性能的影响较小;当机组负荷由50%增加至100%时,ABS沉积区比例在清洁状态下的减小量为5%,在冷段积灰厚度为2 mm时提高至7%。研究结果可为针对性地调整空预器运行参数,从而优化传热效果及减轻积灰腐蚀提供参考。To quantitatively investigate the sensitivity of rotary air preheaters(RAPHs)to operating conditions under fouling conditions,a three-equation thermal calculation model based on the local thermal non-equilibrium model is developed.The study aims to explore the comprehensive effects of fouling distribution and operating conditions on heat transfer performance and the deposition of ammonium bisulfate(ABS)in the air preheater.The impact of fouling thermal resistance and thermal capacity on the air preheater is compared and analyzed.The computational results reveal that the degradation of heat transfer performance due to fouling thermal resistance is significantly greater than the enhancement effect caused by fouling thermal capacity.An increase in the proportion of fouling in the cold end results in a larger proportion of the ABS deposition zone.Furthermore,an increase in the thickness of fouling on the heat storage elements demonstrates that an increase in rotational speed,flow rate,or unit load substantially improves heat transfer performance and reduces the proportion of the ABS deposition zone.The influence of fluid temperature variation on the air preheater performance is relatively minor.When the unit load increases from 50%to 100%,the reduction in the proportion of the ABS deposition zone in the clean state is 5%,which increases to 7%when the thickness of fouling in the cold end reaches 2 mm.The research findings can serve as a reference for targeted adjustment of the operating parameters of the air preheater to optimize heat transfer performance and mitigate fouling corrosion.

关 键 词：回转式空气预热器 积灰 传热 局部热非平衡模型 硫酸氢铵 

分 类 号：TK16[动力工程及工程热物理—热能工程]